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A046268 Largest prime substring in 2^n (0 if none). 2
0, 2, 0, 0, 0, 3, 0, 2, 5, 5, 2, 2, 409, 19, 163, 7, 6553, 131, 2621, 5, 857, 971, 419, 83, 1677721, 5443, 71, 1342177, 43, 709, 107, 83, 4294967, 89, 171798691, 3597383, 6871947673, 3743895347, 779069, 54975581, 511627, 99023, 4398046511, 79609 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..43.

EXAMPLE

2^37 = 1{3743895347}2.

CROSSREFS

Cf. A046260.

Sequence in context: A348341 A330936 A284687 * A202425 A292374 A292376

Adjacent sequences:  A046265 A046266 A046267 * A046269 A046270 A046271

KEYWORD

nonn

AUTHOR

Patrick De Geest, Jun 15 1998

STATUS

approved

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Last modified July 5 23:40 EDT 2022. Contains 355108 sequences. (Running on oeis4.)